Illuminating unit



Oct. 30, 1934. Y I A. F. MARTIN 1,978,907

ILLUMINATING UNIT Filed D60. 24, 1952 2 Sheets-Sheet l 20' v 25 g f 26;26 H 22 22 IO FIG. 30

ALLAN F. MARTIN 22 INVENTOR BY m ATTORNEY Oct. 30, 1934. MARTlN1,978,907

ILLUMINATING UNIT Filed Dec. 24, 1932 2 Sheets-Sheet 2 FIG. 4

ALLAN F. MARTIN INVENTOR ATTORNEY Patented Oct. 30, 1934 UNITED STATESPATENT OFFICE ILLUMINATING UNIT Allan F. Martin, Rochester,- N. Y.,assignor to Bausch & Lomb Optical Company, Rochester, N. Y., acorporation of New York Application December 24, 1932, Serial No.648,783

2 Claims. (Cl. Will-1.4)

that the operation can be completed without interruptions which oftenresult in serious consequences. At the present time practically allsurgical operations are performed under artificial illumination since itcan be readily controlled and directed and is of uniform quality '15irrespective of the prevailing weather conditions or time of the day oryear. In spite of the present day efficiency of artificial electricalilluminating units, it is possible that the incandescent lamp willburnout during the progress of an operation. 20

It then becomes necessary to insert a new lamp as quickly as possible.

One of the objects of my invention is to provide an illuminating devicehaving means wherei by the light source may be readily replaced with 25a minimum of time and efiort. Another object is to provide anilluminating unit having a plurality of lamps which can be selectivelyplaced in operative position. A further object is to pro- Vide a deviceof the type described having a plu- 30 rality of lamps each mounted on amovable bracket whereby any one of the lamps can be quickly placed inoperative position. Other objects and advantages reside in certain novelfeatures of construction, arrangement and combination of parts as willhereinafter be more fully described and pointed out in the appendedclaims.

Referring to the drawings:

Fig. 1 is a side elevation of an illuminating device embodying myinvention.

Fig. 2 is a top plan view of same with parts broken away.

Fig. 3 is a vertical sectional view of same showing the relation of theoptical elements.

Fig. 4 is an enlarged fragmentary view showing the lamp mountings.

A preferred embodiment of my invention is disclosed in the drawingswherein 10 indicates a circular casing having a top 11 and a bottom 12.Mounted at the central part of the casing is a housing 13 which carriesthe condensing lenses liarranged in a ring-like formation. Mounted onthe bottom 12 of the casing are the two bearing posts 15 and 15' whichare positioned, respectively, on opposite sides of the housing 13 whilethe bearing posts 16 and 16' are mounted adjacent to the edge of thebottom member 12.

Rotatably mounted in these two pairs of bearing posts are the shafts 17and 17' to which are respectively secured the two brackets 18 and 18having the cam portions 19 and 19 and the upwardly extending arms 20 and20, respectively.

Mounted, respectively, on brackets 18 and 18' are the two incandescentlamps 21 and 21'. Shafts 17 and 17 are provided, respectively, with handknobs 22 and 22 which are positioned exteriorly of the casing. Thebrackets 18 and 18 extend through slots 23 and 23 in the housing 13. Itwill thus be apparent that either bracket 18 or 18' can be swung into orout of position so as to selectively locate either lamp 21 or 21' inoperative position so that it will send li ht rays through the lenses14. The upwardly extending arms 20 and 20' on the two brackets preventthe accidental breaking of a lamp by the bracket. prevents bracket 18from striking lamp 21 when it is operatively positioned. Lamp 21 mustfirst be swung up out of position before lamp 21 can be placed inoperative position. Leaf springs 24 and 24. contact with the camportions 19 and 19 on the brackets and so prevent the sudden dropping ofeither lamp as it is brought into position.

Electrical energy is supplied from a suitable source by a conductor 25leading to the switches 26 and 26' from whence the conductors 27 and 27lead to the lamps 21 and 21', respectively. Each of the switchescontrols one lamp so that the lamps can be independently operated. Asshown in Fig. 3, each of the lenses 14 cooperates with a lens 28 and aninclined reflector 29 positioned in spaced relation around the peripheryof the bottom member 12. Light rays from the lamp will thus pass throughthe lenses 14 and Z8 and be reflected downwardly and inwardly byreflector 29, the light rays passing through a glass plate 30 whichcovers an opening in the casing member 12. Light rays from the lamp passthrough the various lenses and strike the cooperating reflectors so thata series of beams are directed inwardly and downwardly to a common areato illuminate the field of operation in a manner disclosed in U. S.Patent No. 1,277,109 issued to W. L. Patterson on August 27, 1918.

From the foregoing, it will be apparent that I am able to attain theobjects of my invention and provide an illuminating device having meanswhereby the light source may be readily replaced or renewed with aminimum of time and effort.

In case a lamp burns out during an operation, it

Thus, as shown in Fig. 4, arm 20 is only necessary to swing that lamp upout of the way, swing the new lamp into position and operate the switchto energize the lamp. This change can, obviously, be carried out quicklyand. easily and it is not necessary to take off any covers or open upthe casing. Nor is it necessary to touch a lamp which is probably toohot to handle' The upwardly extending arm on each bracket prevents theoperator from accidentally moving one lamp into contact with the other.Various modifications can obviously be made without departing from thespirit of my invention.

I claim:

1. An illuminatingdevice of the character described comprising a casing,optical elements circularly arranged around the periphery of saidcasing, two posts mounted near the central part of said casing, abracket pivoted on a horizontal axis on each of said posts, a lightsource carried by each of said brackets, a rotatable shaft conjnectedtoeachof said brackets, said shafts extending exteriorly of said casingwhereby said light sources may be independently and selectivelypositioned so as to direct light rays onto said elements.

2. An illuminating device of the character described comprising asubstantially circular casing, optical elements arranged around theperiphery of said casing, two spaced posts mounted near the central partof said casing, a bracket pivotally mounted on each post, a light sourcecarried by each bracket, a rotatable shaft secured to each bracket, saidshafts extending exteriorly of the casing whereby said light sources maybe independently and selectively swung into operative position to directlight rays onto said elements, each of said brackets having an upwardlyextending arm with the arms and brackets lying substantially in the sameplane whereby the bracket not in operative position will be preventedfrom striking the light source in operative position. t 1

ALLAN F. MARTIN.

